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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.lang.foreign.Arena;
import java.lang.foreign.Linker;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.SegmentAllocator;
import java.lang.invoke.MethodHandle;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;
import java.util.stream.Stream;

public class TestDowncallBase extends CallGeneratorHelper {

    Object doCall(MemorySegment symbol, SegmentAllocator allocator, FunctionDescriptor descriptor, Object[] args) throws Throwable {
        MethodHandle mh = downcallHandle(LINKER, symbol, allocator, descriptor);
        return mh.invokeWithArguments(args);
    }

    static FunctionDescriptor function(Ret ret, List<ParamType> params, List<StructFieldType> fields, List<MemoryLayout> prefix) {
        List<MemoryLayout> pLayouts = params.stream().map(p -> p.layout(fields)).toList();
        MemoryLayout[] paramLayouts = Stream.concat(prefix.stream(), pLayouts.stream()).toArray(MemoryLayout[]::new);
        return ret == Ret.VOID ?
                FunctionDescriptor.ofVoid(paramLayouts) :
                FunctionDescriptor.of(paramLayouts[prefix.size()], paramLayouts);
    }

    static Object[] makeArgs(Arena arena, FunctionDescriptor descriptor, List<Consumer<Object>> checks, int returnIdx) {
        List<MemoryLayout> argLayouts = descriptor.argumentLayouts();
        TestValue[] args = new TestValue[argLayouts.size()];
        int argNum = 0;
        for (MemoryLayout layout : argLayouts) {
            args[argNum++] = genTestValue(layout, arena);
        }

        if (descriptor.returnLayout().isPresent()) {
            checks.add(args[returnIdx].check());
        }
        return Stream.of(args).map(TestValue::value).toArray();
    }
}